Standard

　Appearance

　yellow,crystalline powder

　Identification

　A, B, C

　pH

　4.5 – 7.5

　Specific optical rotation

　-203 – -216

　Specific absorbance (353nm)

　290 – 310

　Light -absorbing impurities (430nm)

　≤0.25

　Light -absorbing impurities (490nm)

　≤0.20

　Related substances (HPLC)

　Imp. A ≤ 0.5%
　Imp. B ≤ 2.0%
　Imp. C ≤ 2.0%

　Heavy metals

　≤50ppm

　Water

　6.0% - 9.0%

　Sulphated ash

　≤0.5%

　Assay (HPLC)

　95.0% - 102.0%